<!DOCTYPE HTML>
<html><head>
    <meta charset="utf-8">
    <title></title>
    <style type="text/css">
html,body {
  font-size:12px;
  font-family:monospace;
}
.grid {
  height: 60px;
  border: 1px solid green;
  position: relative;
}

span {
  position: absolute;
  background: lime;
  border: 1px solid black;
  box-sizing: border-box;
}

.test1 span {
  top: 0;
  left: 40px;
  width: 100px;
  height: 20px;
}

.test2 .a {
  top: 0;
  left: 0;
  width: 60px;
  height: 40px;
}
.test2 .b {
  top: 40px;
  left: 20px;
  width: 60px;
  height: 20px;
}
.test2 .c {
  top: 0;
  left: 60px;
  width: 60px;
  height: 20px;
}

.test3 span {
  top: 0;
  left: 40px;
  width: 100px;
  height: 20px;
}

.test4 span {
  top: 0;
  left: 40px;
  width: 100px;
  height: 20px;
}

.test5 span {
  top: 0;
  left: 20px;
  width: 120px;
  height: 20px;
}

.test6 span {
  top: 0;
  left: 0;
  width: 20px;
  height: 20px;
}

.test7 span {
  top: 0;
  left: 0;
  width: 700px;
  height: 60px;
  padding:3px;
}

    </style>
</head>
<body>

<div class="grid test1"><span>a</span></div>

<div class="grid test2">
<span class="a">a</span>
<span class="b">b</span>
<span class="c">c</span>
</div>

<div class="grid test3"><span>a</span></div>

<div class="grid test4"><span>a</span></div>

<div class="grid test5"><span>a</span></div>

<div class="grid test6"><span>b</span></div>

<div class="grid test7"><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;grid</span></div>

</body>
</html>
